Spirit Level | Tool | Britannica

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use in surveying

• In surveying: Height determination

  In spirit leveling the surveyor has for centuries used a surveying level, which consists of a horizontal telescope fitted with cross hairs, rotating around a vertical axis on a tripod, with a very sensitive spirit level fixed to it; the instrument is adjusted until the bubble…

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• In hand tool: Plumb line, level, and square

  The spirit, or bubble, level, a sealed glass tube containing alcohol and an air bubble, was invented in 1661. It was first used on telescopes and later on surveying instruments, but it did not become a carpenter’s tool until the factory-made models were introduced in the…

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